Rhetorical and critical approaches to public relations / edited by Elizabeth L. Toth, Robert L. Heath
Lawrence Erlbaum Associates , 1992
 Buku Teks SO
Preventive measures : building risk assessment and crisis early warning systems / edited, John L. Davies and Ted Robert Gurr
Rowman & Littlefield Publishers, Inc., 1998
 Buku Teks SO
Manchester and Sao Paula: problems of rapid urban growth/ edited by: John D. Wirth; Robert L. Jones
Stanford Univesity Press, 1978
 Buku Teks SO
Crouch, Robert L.
Macroeconomics / Robert L. Crouch
Harcourt Brace Jovanovich , 1972
 Buku Teks
Robinson, Danielm
Borneo
Lonely Publications Pty Ltd, 2011
 Buku Referensi